The main purpose of this book is to give a description of the Cholón language as represented in the Arte de la Lengua Cholona, an eighteenth century grammar written by a Franciscan friar, named Pedro de la Mata. This grammar can be consulted in the British Library (Manuscripts Department, Shelfmark: Additional 25322) in London (United Kingdom). Nowadays, the Cholón language is probably extinct. It was spoken in the Huallaga Valley (department of San Martín and
Huánuco) in northern Peru. Cholón formed a small language family together with the neighbouring language Híbito.